Tubing suspension hanger

ABSTRACT

A tubing or rod gripping device utilizes a generally cylindrical gripping sleeve located in an abutment housing, said gripping sleeve encircling the rod or tubing and having internal gripping teeth on a canted axial bore and, in addition thereto, a smooth bore generally coaxial with the longitudinal central axis of the sleeve and intersecting the canted bore at an acute angle.

I United States Patent 1 1 [in 3,904,233 Berry Sept. 9, 1975 1541 TUBING SUSPENSION HANGER 1,480,815 1/1924 Bynum 294/8629 1,494,022 5/1924 Roberson... 24/249 DP [75] Inventor: Frank Berry Dana 1,754,816 4/1930 Cannifi 294/92 x D t u D H 2,262,429 11/1941 Lucker 24/263 LL x [73] Asslgnee resser Indus "es Inc a as ex 2,310,960 2/1943 Johansen 294/92 X [22] Filed: Nov. 1, 1973 2,699,589 l/1955 Redell 294/102 A X [2]] A I N 411 983 2,700,201 1/1955 Bannister 294/102 A X Primary ExaminerEvon C. Blunk [52] S- l- 2 4/ 2; /2 DP; 2 A; Assistant Examiner-Johnny D. Cherry 4/1 13 Attorney, Agent, or Firm-Michael J. Caddell [51] Int. Cl. E218 19/06 [58] Field of Search 294/86 R, 86.1, 86.14, 57 ABS C 294/8629, 90, 91, 92, 99 R, 102 R, 102 A, l 1 H l 13 I [7; 24/249 R, 249 pp 249 LL 249 A tubing or rod grlpplng device utilizes a generally cypp 249 PC 249 DP. 263 D, 263 DT, 263 lindrical gripping sleeve located in an abutment hous- DS, 263 KH 263 DK 263 CA, 263 DL ing, said gripping sleeve encircling the rod or tubing and having internal gripping teeth on a canted axial [56] Reerences Cited bore and, in addltion thereto, a smooth bore generally COaXldl with the longitudinal central axis of the sleeve UNITED STATES PATENTS and intersecting the canted bore at an acute angle. 836,303 11/1906 Christensen 294/92 X 1,367,273 2/1921 McMichael 294/91 11 Claims, 8 Drawing Figures PATENTED SEP 91575 FIG. 4

TUBING SUSPENSION HANGER BACKGROUND OF THE INVENTION Normally, when running a pipe or rod string into or out of a borehole, a clamping device is utilized to sus' pend the string in the hole while another joint or section is threaded onto the top of the string or removed from the string.

In the past, these clamping devices have consisted of toothed clamping collars which are levered against the casing by external levers and linkages. An example of this type device is shown in US. Pat. Nos. 1,552,062 and 1,654,866. Other types of clamps utilize conical toothed inserts located in a tapered cylinder which are wedged against the tubing or rod. An example of this device is shown in US. Pat. No. l,0l7,305.

The deficiencies of these devices include their complexity, their inability to hold properly under all conditions, and the difficulty of installing from the middle of a long string section when the ends of the string are not readily accessible.

This invention solves the above problems by providing an inner toothed, generally cylindrical, unitary gripping member located concentrically and pivotably in a flanged container or abutment housing and encircling the pipe or rod to be clamped and suspended. The invention utilizes the pipe strings own weight to establish a rotational moment in the gripping member which forces the gripping member toward gripping engagement with the tubing or rod string.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a cross-sectional side view of the apparatus in a relaxed, non-engaged position;

FIG. 2 illustrates the apparatus of FIG. 1 in a gripping position on the tubing;

FIG. 3 illustrates a cross-sectional view of the apparatus taken at line 33 of FIG. 2;

FIGS. 4 and 4a illustrate a cross-sectional side view and a top view of adifferent embodiment of the abutment housing;

FIG. 5 illustrates a top view of a different embodiment of the gripping sleeve;

FIGS. 6 and 60 illustrated a top view and a crosssectional side view of a third embodiment of the gripping sleeve.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring particularly to FIGS. l-3, the invention is disclosed as having a tubular, generally cylindrical grip ping sleeve 1 located fairly loosely within a sleeve chamber or abutment housing 2. The gripping sleeve is also located slidably on the tubing or rod string 3 which passes through the apparatus. The gripping sleeve 1 has a dual axis bore passage passing longitudinally therethrough with one axis 10 being generally coaxial with the central longitudinal cylindrical axis of the sleeve. A second portion of the bore passage is a cylindrical bore having a canted axis 1 I intersecting the bore of axis 10 at an acute angle 12. Angle 12 may vary from about 5 up to about 45 and preferably is from 17 to 25.

The location of two cylindrical bore passages within the gripping sleeve, with their axes at an angle to each other allows the partial pivoting of the sleeve in the housing 2 about the rod or tubing string 3.

In FIG. 1 the sleeve is shown in the relaxed, nonengaging orientation with the canted axis 11 aligned with the central longitudinal axis of the pipe string passing through the sleeve. In FIG. 2 the pipe string axis coincides with axis 10 of the sleeve.

The bore passage formed along axis 10 contains a plurality of gripping teeth 13 formed as circumferential annular ridges on the inner wall of the sleeve in that portion of bore passage 10 not coinciding with bore passage 11.

Each tooth or ridge 13 has an upper surface at an angle of from 60 to to axis 10 and a lower slanted face going downward to the next adjacent tooth. The teeth are specifically arranged with the substantially perpendicular faces on the upper side so that the teeth will bite into the tubing or rod when it attempts to move downward against the teeth, but will be cammed out away from the tubing or rod when it moves upward against the teeth. This allows the rod or tubing to be moved upward through the apparatus at any time regardless of the position of sleeve 1.

The sleeve has a canted lower end 14 and an abutment shoulder 15, the upper surface of sleeve 1 may also be canted slightly or may be normal to axis 10.

The sleeve is contained in a hollow chamber 16 inside abutment housing 2. The housing may be polygonal or cylindrical in configuration. It contains a bottom plate 17 having a bore passage 18 therethrough for receiving the tubing or rod string 3. The remainder of bottom plate 17 serves to form an inwardly projecting annular abutment shoulder I7a which selectively abuts shoulder 15 of sleeve 1.

Bottom plate 17 has an outwardly projecting annular flange 17b having bolt holes passing therethrough. Flange 17b is adapted to allow the abutment housing to be bolted to a permanent structure, frame, drilling table, or wellhead via bolts passing through holes 18a.

The housing inner walls may be canted, as at 19 and 20, to allow pivoting movement of sleeve 1, within the housing without causing interference between the housing and the sleeve.

Attached to one side of the inner chamber 16 is a curved leaf spring 21 attached to the housing and resiliently abutting sleeve 1, tending to continuously urge the gripping sleeve into the canted, non-engaging orientation as shown in FIG. 1.

An actuating arm 22 is pivotally pinned at 23 in a recessed area 24 in the wall of the housing. Arm 22 has an activating lever 25 projecting partially through a radial opening 26 in the housing wall from the pivot pin 23 and at approximately a right angle with arm 22.

An operating lever 27 extends partially through opening 26 and abuts lever 25 such that downward force on lever 27 is transferred into lever 25 and into arm 22 moving it inward into the housing against sleeve 1 which in turns pivots the sleeve in the housing to the position shown in FIG. 2.

An upper abutment head 28 is secured to the housing 2 and provides a top closure 28a to the chamber 16 and an opening 29 for the tubing string 3. Head 28 may be threadedly attached to housing 2 or by bolts, weldment, or any other suitable means.

FIG. 3 illustrates the structure of FIG. 2 taken at line 3-3 of FIG. 2 and shows the gripping sleeve 1 pivotally attached to housing 2 by means of pivot pins 30 threadedly engaged in and passing through the wall of housing 2 and projecting inwardly into recesses 31 formed in the side of sleeve 2.

OPERATION OF THE FIRST EMBODIMENT When it is desirable to utilize a clamping and/or suspension means for tubing or rod strings in a wellbore, the present invention is particularly advantageous and is placed in operation by inserting the sleeve 1 into housing 2, inserting the pivot pins 30, and attaching upper head 28. The apparatus may then be lowered over the upwardly projecting rod or tubing end or the string may be lowered down through the apparatus.

The housing is then secured to rigid means such as a frame, wellhead, drilling table, etc., by attaching with bolts through holes 18a in flange 17b or by clamping means or other devices.

In the relaxed, non-engaging position as shown in FIG. 1, the bore axis 11 ofthe sleeve is aligned with the central axis of the tubing string and there is sufficient room in bore 11 of sleeve 1 to pass tubing and connec tor collars unhindered therethrough.

When the string has been lifted or lowered the required distance through sleeve 2 and it is then desired to let the string hang by its own weight suspended in the wellbore, the lever 27 is depressed downward, moving arm 22 against sleeve 1 thereby pivoting it about pins 30 until teeth 13 are brought into contact with the tubing. Then the weight is eased down on the tubing forcing abutment shoulder 15 against inner shoulder 17a of bottom plate 17. This junction of one side of the bottom of sleeve 1 with the plate 17 applies a rotational moment to the sleeve, forcing it into further pivotal movement toward the string and causing teeth 13 to bite into the wall of the string thereby securely gripping the string and holding it there. The perpendicular faces of the teeth are arranged to bite deeper into the tubing string with increasing application of downward force and the sloped lower faces of the teeth allow them to be cammed out of engagement with the tubing upon upward movement of the string through the sleeve. Such an upward movement removes the rotational moment from the sleeve and spring 21 urges the sleeve into the canted non-engaging position once again. Should the sleeve adhere to the string as it moves upward it will be dislodged by abutment with head 28 and return to its non-engaged position.

ALTERNATE EMBODIMENTS Referring now to FIGS. M alternate constructions of the invention are illustrated, which embodiments are particularly advantageous when access to the end of the tubing string is hindered and it is desirable to place the clamping or suspension means on the string from the side rather than over the end.

In FIG. 4 an alternate housing construction is shown as having a lower abutment housing 102 with walls 104 and integral bottom plate 117. An upper head 128 is attached to housing 102 by removable means such as threaded bolts 105.

Upper head 128 has a central bore opening 129 for allowing passage of the tubing string 3 therethrough. Head 128 also has an entrance slot 106 passing therethrough and running from the central opening 129 radially outward to the outward circumference which allows the head to be slipped onto a tubing string from the side rather than having to go over the end of the tubing string.

Housing lower plate 117 likewise has a central opening 118 for allowing the tubing string 3 to pass therethrough unhindered. A radial slot 107 is formed through plate 117 from opening 118 through the circumference of the plate to allow the housing to be slipped onto the tubing string from the side as was the head 128.

After the housing and upper head have been placed on the tubing string and before the head is attached to the housing, the upper head will be rotated on the string about degrees to move slot 106 diametrically opposite slot 107 and prevent the housing from coming off the tubing string. This relationship is shown in the top view shown in FIG. 40.

FIGS. 5, 6 and 6a show two embodiments of the gripping sleeve which will allow placement of the sleeve on the tubing string from the side rather than over the end of the tubing. In FIG. 5 the sleeve 101 is formed in two halves or is manufactured in one piece and later cut in half so that it can be placed about the tubing and then the halves rejoined together by securing them with means such as bolts 108.

FIGS. 6 and 6a illustrate a top and a cross-sectional side view respectively of a gripping sleeve 201 which has been formed similar to the sleeve 1 of FIGS. 1-3, but having the additional feature of a longitudinal slot 206 running from the central bore passage through the outer wall of the sleeve 20] along the entire length of the sleeve to allow it to be slipped over the tubing string from the side.

Once the sleeve 201 has been slipped over the tubing and located in housing 102 it will be prevented from moving sideways off of the tubing by the physical confinement of the housing walls and upper and lower head plates plus pivot pins in the housing wall similar to pins 30 in FIG. 3.

After the housing and sleeve have been slipped on the tubing string and assembled in place with the upper head attached to the housing, the operation of the apparatus is similar to that of the embodiments of FIGS. 1-3.

Although certain preferred embodiments of the present invention have been herein described in order to provide an understanding of the general principles of the invention, it will be appreciated that various changes and innovations can be effected in the described tubing or rod hanger apparatus without departure from these principles. For example, although the housing and gripping member are both depicted as being cylindrical, it is clear that there are many possible physical configurations for these elements, such as polygonal or spherical. Also other spring means than the leaf spring shown could be used between the housing and sleeve, for instance coil springs or belleville springs would be operable therein. All modifications and changes of this type are deemed to be embraced by the spirit and scope of the invention except as the same may be necessarily limited by the appended claims or reasonable equivalents thereof.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. Well conduit clamping and suspension apparatus comprising:

pivotable unitary gripping sleeve means adapted to encircle a conduit and having a plurality of gripping teeth therein, said sleeve means having a dual axis bore passage passing longitudinally therethrough, with one axis of said bore passage canted at an acute angle to the other axis and one axial portion of said bore passage having said gripping teeth therein;

abutment means arranged to abut one side of said sleeve means and induce a rotational moment therein in response to downward movement of the well conduit against said gripping teeth; and, means for selectively pivoting said sleeve means on the well conduit and thereby abutting said teeth against the conduit. 2. The well conduit clamping apparatus of claim 1 wherein said pivoting means comprises:

first lever means pivotally pinned to said abutment means and arranged to be pivoted at one end into abutment with said sleeve means; and, second lever means pivotally mounted on said abutment means and projecting through the wall outwardly thereof, said second lever means arranged to abut and engage said first lever means and further being capable of activating said first lever means. 3. Well conduit clamping and suspension apparatus comprising:

pivotable unitary gripping sleeve means adapted to encircle a conduit and having a plurality of gripping teeth therein, said sleeve means having a dual axis bore passage passing longitudinally therethrough, with one axis of said bore passage canted at an acute angle to the other axis and one axial portion of said bore passage having said gripping teeth therein; abutment means arranged to abut one side of said sleeve means and induce a rotational moment therein in response to downward movement of a well conduit against said gripping teeth; means for selectively pivoting said sleeve means on a well conduit and abutting said teeth against the conduit; spring means between said abutment means and said sleeve means, said spring means arranged to abut said sleeve means and yieldingly urge said toothed portion of said sleeve means away from engagement with the well conduit; and, said sleeve means further comprising a generally cylindrical gripping sleeve having gripping teeth at diametrically opposite sides and opposite ends of said internal bore passage, said sleeve further having a canted lower surface with an abutment shoulder thereon arranged to abut said abutment means while the remainder of said canted surface does not contact said abutment means. 4. The well conduit clamping apparatus of claim 3 wherein said abutment means further comprises:

an abutment housing having means thereon for attachment to a permanent structure and having a bore passage therethrough capable of passing the well conduit through it and having upper and lower abutment flange means adapted to contain said sleeve means against unlimited upward and downward movement; and, said abutment housing further having a removable portion thereof capable of allowing insertion of 6 said gripping sleeve into said housing. 5. The well conduit clamping apparatus of claim 4 wherein said abutment housing further comprises a generally cylindrical tubular housing having an inwardly projecting lower annular abutment shoulder and an outwardly projecting lower flange, an upper abutment head removably secured to said housing and having an inwardly projecting upper abutment shoulder, and a pair of pivot pins mounted in said housing in opposite walls thereof and engaging said sleeve.

6. The well conduit clamping apparatus of claim 4 wherein said abutment housing and said sleeve each have a longitudinal slot passing entirely through one side thereof and communicating from the outer periphery to said well conduit bore passage each said slot capable of passing over said well conduit thereby permitting installation of said well conduit clamping apparatus on the well conduit from the side.

7. The well conduit clamping apparatus of claim 4 wherein said abutment housing has a longitudinal slot passing entirely through one side thereof and communicating from the outer periphery to said well conduit bore passage, said slot arranged to allow passage of said well conduit therethrough, thereby allowing placement of said abutment housing on said well conduit from the side; and said gripping sleeve being divided along said bore passage into two sections with means for securing two sections together about said well conduit means.

8. A gripping member for gripping the exterior of a well conduit or rod string and providing an abutment means for suspending said well conduit or rod string, said gripping member comprising:

a tubular member adapted to encircle well conduit and having two intersecting bore passages therein and an abutment shoulder on one end thereof said bore passages having intersecting central longitudinal axes;

the first of said bore passages allowing unhindered movement of the conduit therethrough and the second the bore passage having gripping teeth therein adapted to engage and grip the well conduit; and,

said tubular member further adapted to abut an external abutment and be pivoted from substantial coaxial alignment of the longitudinal central axis of said first bore passage on the well conduit to substantial coaxial alignment of the longitudinal axis of said second bore passage on the well conduit with said gripping teeth engaging the well conduit; said abutment causing a rotational moment in said tubular member forcing said teeth into tighter engagement with the well conduit.

9. The gripping member of claim 8 wherein said tubular member is a generally extended elongated tubular member, said bore passages extend generally longitudinally therethrough, and said first and second passages intersect at an angle of from about 5 up to about 45; with said tubular member further adapted so that only one side of the lower end will abut a flat surface normal to the longitudinal axis of said tubular member thereby introducing a rotational moment in said tubular member upon abutting said tubular member downward upon a relatively flat surface, said rotational moment arranged to rotate said tubular member into teeth-engaging position on the well conduit.

10. A tubing spider for suspending tubing strings from a permanent grounded structure said spider comprising:

an elongated tubular member having a bore passage therethrough containing gripping teeth and capable of receiving the well tubing therein; said tubular member adapted to be partially pivoted on the tubabutment means adapted to be secured to the permaing from non-engaging position to a tubing engaging position with said teeth arranged to engage the tubing in said engaging position; and,

nent ground structure and abut one side of the lower end of said tubular member upon downward movement of the tubing thereby forcing said teeth abutment means adapted to be secured to the permanent ground structure and abut one side of the lower end of said tubular member upon downward movement of the tubing thereby forcing said teeth into gripping engagement with the tubing.

11. A tubing spider for suspending tubing strings 10 from a permanent grounded structure, said spider comprising:

an elongated tubular member having a bore passage into gripping engagement with the tubing;

said abutment means further comprising a hollow housing having a removable upper head and a lower plate, said housing adapted to contain said tubular member and having bore passage therethrough for receiving the tubing; said housing further having means for pivotally securing said tubular member, lever means passing through the wall therethrough containing gripping teeth and capathereof and arranged to pivot said member, and spring means arranged between said housing and ble of receiving the well tubing therein; said tubular 5 member adapted to be partially pivoted on the tub- 531d member tendmg commucusly yleldably ing from non-engaging o iti n t a t bi engagurge said member out of engagement with the tubing position with said teeth arranged to engage the ing. tubing in said engaging position;

22 UNITED STATES eATENT OFFICE CERTIFICATE OF CORRECTION -Patent.No. 3,904,233 Dated September 9, 1915 Inventor(s) Robert Frank Berry 1: is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as s'hbwn below:

eelumn 6 Line 37 delete "the" and insert -sa1d---.

Signed and Scaled this A nest:

RUTH C. MASON C. IAISIIALI. DAMN Anesling Officer (0mm iniuner nfhums and Tmlulllrks 

1. Well conduit clamping and suspension apparatus comprising: pivotable unitary gripping sleeve means adapted to encircle a conduit and having a plurality of gripping teeth therein, said sleeve means having a dual axis bore passage passing longitudinally therethrough, with one axis of said bore passage canted at an acute angle to the other axis and one axial portion of said bore passage having said gripping teeth therein; abutment means arranged to abut one side of said sleeve means and induce a rotational moment therein in response to downward movement of the well conduit against said gripping teeth; and, means for selectively pivoting said sleeve means on the well conduit and thereby abutting said teeth against the conduit.
 2. The well conduit clamping apparatus of claim 1 wherein said pivoting means comprises: first lever means pivotally pinned to said abutment means and arranged to be pivoted at one end into abutment with said sleeve means; and, second lever means pivotally mounted on said abutment means and projecting through the wall outwardly thereof, said second lever means arranged to abut and engage said first lever means and further being capable of activating said first lever means.
 3. Well conduit clamping and suspension apparatus comprising: pivotable unitary gripping sleeve means adapted to encircle a conduit and having a plurality of gripping teeth therein, said sleeve means having a dual axis bore passage passing longitudinally therethrough, with one axis of said bore passage canted at an acute angle to the other axis and one axial portion of said bore passage having said gripping teeth therein; abutment means arranged to abut one side of said sleeve means and induce a rotational moment therein in response to downward movement of a well conduit against said gripping teeth; means for Selectively pivoting said sleeve means on a well conduit and abutting said teeth against the conduit; spring means between said abutment means and said sleeve means, said spring means arranged to abut said sleeve means and yieldingly urge said toothed portion of said sleeve means away from engagement with the well conduit; and, said sleeve means further comprising a generally cylindrical gripping sleeve having gripping teeth at diametrically opposite sides and opposite ends of said internal bore passage, said sleeve further having a canted lower surface with an abutment shoulder thereon arranged to abut said abutment means while the remainder of said canted surface does not contact said abutment means.
 4. The well conduit clamping apparatus of claim 3 wherein said abutment means further comprises: an abutment housing having means thereon for attachment to a permanent structure and having a bore passage therethrough capable of passing the well conduit through it and having upper and lower abutment flange means adapted to contain said sleeve means against unlimited upward and downward movement; and, said abutment housing further having a removable portion thereof capable of allowing insertion of said gripping sleeve into said housing.
 5. The well conduit clamping apparatus of claim 4 wherein said abutment housing further comprises a generally cylindrical tubular housing having an inwardly projecting lower annular abutment shoulder and an outwardly projecting lower flange, an upper abutment head removably secured to said housing and having an inwardly projecting upper abutment shoulder, and a pair of pivot pins mounted in said housing in opposite walls thereof and engaging said sleeve.
 6. The well conduit clamping apparatus of claim 4 wherein said abutment housing and said sleeve each have a longitudinal slot passing entirely through one side thereof and communicating from the outer periphery to said well conduit bore passage each said slot capable of passing over said well conduit thereby permitting installation of said well conduit clamping apparatus on the well conduit from the side.
 7. The well conduit clamping apparatus of claim 4 wherein said abutment housing has a longitudinal slot passing entirely through one side thereof and communicating from the outer periphery to said well conduit bore passage, said slot arranged to allow passage of said well conduit therethrough, thereby allowing placement of said abutment housing on said well conduit from the side; and said gripping sleeve being divided along said bore passage into two sections with means for securing two sections together about said well conduit means.
 8. A gripping member for gripping the exterior of a well conduit or rod string and providing an abutment means for suspending said well conduit or rod string, said gripping member comprising: a tubular member adapted to encircle well conduit and having two intersecting bore passages therein and an abutment shoulder on one end thereof said bore passages having intersecting central longitudinal axes; the first of said bore passages allowing unhindered movement of the conduit therethrough and the second the bore passage having gripping teeth therein adapted to engage and grip the well conduit; and, said tubular member further adapted to abut an external abutment and be pivoted from substantial coaxial alignment of the longitudinal central axis of said first bore passage on the well conduit to substantial coaxial alignment of the longitudinal axis of said second bore passage on the well conduit with said gripping teeth engaging the well conduit; said abutment causing a rotational moment in said tubular member forcing said teeth into tighter engagement with the well conduit.
 9. The gripping member of claim 8 wherein said tubular member is a generally extended elongated tubular member, said bore passages extend generally longitudinally therethrough, and said first and second passages intersect at an anglE of from about 5* up to about 45*; with said tubular member further adapted so that only one side of the lower end will abut a flat surface normal to the longitudinal axis of said tubular member thereby introducing a rotational moment in said tubular member upon abutting said tubular member downward upon a relatively flat surface, said rotational moment arranged to rotate said tubular member into teeth-engaging position on the well conduit.
 10. A tubing spider for suspending tubing strings from a permanent grounded structure said spider comprising: an elongated tubular member having a bore passage therethrough containing gripping teeth and capable of receiving the well tubing therein; said tubular member adapted to be partially pivoted on the tubing from non-engaging position to a tubing engaging position with said teeth arranged to engage the tubing in said engaging position; and, abutment means adapted to be secured to the permanent ground structure and abut one side of the lower end of said tubular member upon downward movement of the tubing thereby forcing said teeth into gripping engagement with the tubing.
 11. A tubing spider for suspending tubing strings from a permanent grounded structure, said spider comprising: an elongated tubular member having a bore passage therethrough containing gripping teeth and capable of receiving the well tubing therein; said tubular member adapted to be partially pivoted on the tubing from non-engaging position to a tubing engaging position with said teeth arranged to engage the tubing in said engaging position; abutment means adapted to be secured to the permanent ground structure and abut one side of the lower end of said tubular member upon downward movement of the tubing thereby forcing said teeth into gripping engagement with the tubing; said abutment means further comprising a hollow housing having a removable upper head and a lower plate, said housing adapted to contain said tubular member and having bore passage therethrough for receiving the tubing; said housing further having means for pivotally securing said tubular member, lever means passing through the wall thereof and arranged to pivot said member, and spring means arranged between said housing and said member tending to continuously yieldably urge said member out of engagement with the tubing. 